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NullPointerException even when variables are not null


NullPointerException even when variables are not null

By : niccoloman2
Date : November 22 2020, 10:33 AM
I hope this helps . I'm currently designing a program to simulate an airport. I ran into a problem and I've already tried my best to figure out the problem and posting to this site was my final resort. , The problem lies in the second if statement
code :


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Custom adapter's getview throws NullPointerException when variables are not null

Custom adapter's getview throws NullPointerException when variables are not null


By : ChrisBrown
Date : March 29 2020, 07:55 AM
this one helps. I am trying to set custom adapter to display messages to user using demo chat application on list view , but receiving errors in getView method of my custom list adapter . , You have
code :
convertView = LayoutInflater.from(mContext).inflate(R.layout.listener, parent, false);
holder.message = (TextView) convertView.findViewById(R.id.text1);
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/text1"
holder.message = (TextView) convertView.findViewById(R.id.text1);
holder.message.setText("lol");
convertView = LayoutInflater.from(mContext).inflate(R.layout.listitem, parent, false);
NullPointerException even though variables aren't null

NullPointerException even though variables aren't null


By : Amitesh007
Date : March 29 2020, 07:55 AM
wish of those help I have written a method to update a user's password in SQLite. , If you comment out the
code :
checkDB.execSQL("UPDATE Students SET Student_Password=" + newPassword2String + "WHERE CNumber=" + sessionName);
java, a string method should return null if the parameter is null but it throws NullPointerException

java, a string method should return null if the parameter is null but it throws NullPointerException


By : ThomasD
Date : March 29 2020, 07:55 AM
Does that help , It should be:
code :
if ( phrase == null || phrase.isEmpty() ) 
  return null;
Why doesn't equals throw NullPointerException when one of the variables is pointing to null

Why doesn't equals throw NullPointerException when one of the variables is pointing to null


By : olstearn
Date : March 29 2020, 07:55 AM
it helps some times It's because the contract for the equals method, as specified in the Javadoc for the Object.equals method , explicitly states:
java.lang.NullPointerException: null value in entry: url=null Selenium Webdriver

java.lang.NullPointerException: null value in entry: url=null Selenium Webdriver


By : Habeeb Kotun Jr.
Date : March 29 2020, 07:55 AM
Hope that helps This is the error you get when you try to add a null object to an immutable map in the google common library. My guess would be that the org.openqa.selenium.remote.RemoteWebDriver.get is attempting to find do that and your file path is null or something similar. I would check the url but that is only a guess.
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